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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d83a096b0ead46f2171b0c9b5fc5a80a0843cea676d92186c3eafd9f053123' 
  AND token = 'DZ8oNpyMskT5JiHfwiQXpzJ6THz+qnmrB4qcWb87qjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}